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It was a great progress and improvement that players are now able to craft not only off packers, but also out of the apartment inventory once they are in the room.

I think it would be a good thing if those entitled to take stuff out of the guildhall inventory (i.e. leader and HO if subbed) would also be able to craft off the GH inventory.

Hmm, i can see how this COULD be a good idea. However, if I were to equip a craft tool and bring up the craft window in our current guildhall, I would get more suggestions for each slot than could be fit onto a screen (for some reason its fun to gather one of each mat on all of atys, it seems)

Due to this, I'd rather keep it to apt and mektoubs only.

I fail to see the problem. Every serious crafter doing research crafting some category, say amps, daggers, guns etc. will put every applicable material at hand into bag, onto packers and mount, or into appartment inventory. I have probably never had the absolute maximum of mats available, but, in the old times, close to it for sure. That will not even blow a packer's inv much less an apt. My screen never exploded anyway.

In a GH a wider variety of stuff will be around never showing up in any crafting window. The mere difference in bulk is 10.3k GH + bag, 2.3k apt + bag, and 2.1k packers + mount + bag. If screen width would have been an issue it would have shown up long before.

What would happen if 2 officers try to craft the same mats at the same time ?
Let's say, during OP war, guys who defends try to make ammo with the same stack of mats in GH.

This is a new situation that never occurs with private inventories.
So it might brings some new bugs in the game.

You are right that this is a problem which needs to be addressed. A solution would be kind of a GH craft mission to obtain at a GH workbench (similar to occupation workbenches), granting the right to craft for, say 10 min or until abandoned or player logging out or leaving the guild - or an HO being kicked or demoted by the leader. During that time nobody else could take stuff out of the GH.

That check already exists... you can see it if you hit the craft button too fast and your inv runs out of mats. The message is something like 'you don't have the materials required to make this item'.

I think it would be nice to be able to craft from GH. If you don't want to, you can still pick up the materials and craft from your own inventory (materials in craft window are sorted by which bag they are in).